?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Visschers%2C+J.&rft.aufirst=J.&rft.aulast=Visschers&rft.degree=Master&rft.date=2010&rft.title=Life+Sciences+cluster+in+de+stad+Groningen%3F